|Publication number||US4613279 A|
|Application number||US 06/592,325|
|Publication date||Sep 23, 1986|
|Filing date||Mar 22, 1984|
|Priority date||Mar 22, 1984|
|Also published as||CA1222432A, CA1222432A1|
|Publication number||06592325, 592325, US 4613279 A, US 4613279A, US-A-4613279, US4613279 A, US4613279A|
|Inventors||Dean R. Corren, Gabriel Miller|
|Original Assignee||Riverside Energy Technology, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (37), Referenced by (101), Classifications (18), Legal Events (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a kinetic hydro energy conversion system and in particular to an underwater turbine-generator for use therewith.
It has long been desirable to utilize free flowing water in rivers or estuaries for the generation of electricity. Several prior art patents have been issued wherein such systems have been disclosed, however these prior art patents have not resulted in any commercially effective kinetic hydro energy conversion system.
The main object of the present invention is to provide an underwater turbine-generator for a kinetic hydro energy conversion system which advances the state of the art simultaneously in several areas to obtain an underwater axial flow turbine which is not unlike such turbines which are used for wind energy conversion, but differing in important respect to obtain an efficient underwater turbine-generator for use in free-flowing water.
The present invention, unlike previous efforts to generate electricity from flowing water, is practical and economic because its design uses both modern techniques and simple construction to achieve long term unattended operation.
A further object of the present invention is to provide a kinetic hydro energy conversion system for unidirectional river flow wherein the turbine generator preferably includes a turbine mounted and held in place by a heavy reinforced concrete base which is either entirely prefabricated or prefabricated as a caisson and poured in place on the river bottom. Tied to the steel reinforcement of the concrete base is a strong steel structure which supports both the turbine and its protective screen. The turbine rotor must be protected from submerged objects carried by water current and this is preferably achieved by a screen made of steel bars, constructed so as to deflect rather than trap debris. In a preferred embodiment according to the present invention, a plumb bow screen is used which has a novel design which protects the circular area of the rotor utilizing a single straight leading edge, parallel grid bars and cause only horizontal deflection of debris.
The turbine rotor is preferably configured so that water flowing past the rotor causes it to rotate which in turn causes the gear box and generator shafts of the turbine to rotate. The rotor may be located either upstream or downstream of the machinery and it can be comprised of any number of blades, with two to six being the most preferred.
The turbine rotor according to the present invention is substantially designed according to the Glauert propeller theory. This theory has been utilized for the water environment, which is significantly different from that of air in terms of density, velocity and the potential for cavitation. The rotor design according to the present invention has taken these factors into account and additional factors having to do with the actual strength and geometry of the water rotors. These considerations have resulted in the creation of conformal blades and this design solves the problem that the chord of a given blade section is on the order of the radial distance of that section and thus, simple, flat, tangent foil shaped incur error in terms of contradicting the assumptions of the Glauert theory.
Specifically, the conformal blades in accordance with the present invention cause the airfoil sections to be aligned with the direction of rotating motion of the blades. This correction has been found to be especially important near the hub. In the conformal blades, the flat foil sections are effectively curved around the surface of an imaginary cylinder coaxial with the rotor and of a radius equal to that of the section.
The present invention also includes mechanical and electric generation components situated in a watertight containment or nacelle. These components are protected from water intrusion by various static seals and an arrangement of long-life, high effectiveness rotating shaft face seals for the low speed rotor shaft. In accordance with the present invention, the shapes of the rotor hub and shaft housing can be such that they act as a classifier, which, by the rotation of the hub, passively tends to expel destructive water borne particles from the area of the seal thus helping to prolong its life. Significant water intrusion through the seals can be detected and causes turbine shut down and alarm.
In an alternative embodiment, the nacelle is eliminated by using a unitary sealed torque hub for the gearbox with a face mount generator mounted directly to it. Both of these components are fully sealed and require no separate nacelle. This embodiment also has the advantage of achieving the most efficient cooling by the ambient water.
The rotating mechanical components in the present invention include the slow speed shaft, couplings, gearbox, high speed shaft, brake (optional) and electric generator. Rotor speed for this device is approximately 60 rpm for a 12 foot diameter machine which is inherently low compared to that of practical electric generators. The speed must be increased by a gearbox to a generator speed in the range of approximately 900 to 3600 rpm. Furthermore, the water speed and thus rotor speed varies over a range, and thus means are provided to generate electricity usefully at different speeds of rotation. This is accomplished in a number of ways, including DC to synchronous AC, asynchronous AC to DC to synchronous AC, an AC induction generator, and a number of other techniques which to electronically provide synchronous AC power with a variable-speed prime mover.
Power, signal and control conductors are taken to a point on shore for control and protection and eventual interconnection by submarine electric cables.
In another embodiment of the present invention, a box or building on shore will contain control logic and protective relaying for one or more turbine units. The box or building also contains devices for conditioning the power for interconnecting with the utility grid or local demand.
In a further embodiment according to the present invention, the system is usable with a bidirectional resource such as tidal estuaries and wherein the aforementioned embodiment further comprises means mounting the turbine to articulate around the yaw axis, thus capturing energy in both directions. Since, unlike wind, reversing water currents are approximately opposite in direction, this yaw device can incorporate stops which permit only slightly less than 180 degree rotation, thereby eliminating the need for expensive and potentially unreliable slip rings. In this case, the entire turbine and screen structure will turn together as a unit around a yaw bearing in a vertical pylon.
The present invention will now be described in more detail with regard to the following description and the attached drawings, wherein:
FIG. 1 is a front view of a turbine according to the present invention;
FIG. 2 is a side view of the turbine of FIG. 1;
FIG. 3 is a front view of a nonconformal blade;
FIG. 4 is a sectional view of a different sections of FIG. 3;
FIG. 5 is a front view of a conformal blade according to the present invention;
FIG. 6 is a partial cutaway view of the turbine according to the present invention;
FIG. 7 is a partial sectional and cutaway view of the turbine of FIG. 6;
FIG. 8 is a perspective view of the turbine of FIG. 6 with a plumb bow screen according to the present invention;
FIG. 9 is a front view of an alternative embodiment of the present invention;
FIG. 10 is a side view of the embodiment of FIG. 9;
FIG. 11 is a top view of the embodiment of FIG. 9; and
FIG. 12 is a schematic representation of a system according to the present invention; and
FIG. 13 shows an alternative embodiment.
Referring now to FIGS. 1-2, a kinetic hydro energy conversion system 10 includes a heavy reinforced concrete base 11 to which a steel support structure 17, 18 and 19 are connected for supporting both the turbine 30 and its protective screen 20.
In the embodiment shown in FIGS. 1 and 2, the screen 20 is constructed of steel bars so as to deflect rather than trap debris. The novel design shown in FIGS. 1 and 2, protects the circular area of rotor 33 utilizing a single straight leading edge comprising the spine 19 which is part of the support structure and has parallel grid bars 21 connecting the spine 19 to the back supports 18 and causing only horizontal deflection of debris.
The turbine shown in FIGS. 1 and 2 has a partial nacelle 36 and a unitized torque hub meaning the torque hub 34 has the motor 35 mounted directed to it in a sealed housing. Wires 12a pass through a conduit in a protected position on the screen 20 and pass through the concrete base and outwardly thereof as wires 12b for connection.
The blades used in rotor 33 are shown in more detail in FIGS. 3-5. FIGS. 3 and 4 show the configuration of a nonconformal blade in a front view in FIG. 3 and a sectional view at lines A, B and C in FIG. 4.
The conformal blades differ from the nonconformal blades in that it solves the problem that the chord of a given blade section is on the order of the radial distance of that and thus simple, flat, tangent foil shapes incur error in terms of contradicting the assumptions of the Glauert theory of wind propeller design. The conformal blades cause the airfoil sections to be aligned with the direction of rotating motion of the blades. In particular, near the hub, the flat foil sections are effectively curved around the surface of the imaginary cylinder coaxial with the rotor and of a radius equal to that of the section. FIG. 5 illustrates the three dimensional phenomonon in a two dimensional figure.
FIGS. 6-7 illustrate the mechanical and electrical generation components in a water tight nacelle in accordance with the present invention. In the embodiments shown in FIG. 6, the main shaft 41 extends from a unitary nacelle 50 which forms a housing torque hub for the gearbox 46 and generator 48. The elements are interconnected as shown, with the main shaft 41 extending out of the shaft housing 43 which has mounting studs 42 extending therefrom. The main shaft 41 is coupled by a low speed shaft coupling 44 in nacelle 50 to gearbox 46 whose output shaft is coupled by a high speed shaft coupling 47 to generator 48. Gearbox 46 and generator 48 are further supported by a shovel base 45.
FIG. 7 shows in more detail the seals and other means utilized to provide a water tight containment of the mechanical and electrical generation components of the system according to the present invention.
As can be clearly seen, the shaft housing 43 is mounted by way of mounting studs 42 on a mounting ring 61. The rotor hub 52 having blades 51 depending therefrom and a nose cone or fairing 53 at the front thereof is mounted on main shaft 41 with key way 41a preventing any relative rotation. The rear of nacelle 50 has a rear fairing 53A to help to flow smoothly thereover.
It should be noted, that the configuration of the rotor hub and shaft housing as shown in FIG. 7 form a classifier 70, which, by the rotation of the hub, passively tends to expel desctructive water borne particles from the area of the outboard seal 64 disposed between the shaft sleeve 65 and the shaft housing 43.
Other portions of the shaft mounting comprise an outboard main seal cavity 66 around the thrust collar 67 and further sealed by shaft seals 68. Additionally, an inboard main seal cavity 69 is formed in front of a front main bearing 71. The shaft is also mounted by a rear main bearing 72 held by a rear main bearing carrier 73 and a rear main bearing retaining in oil seal 74. The shaft housing 43 also includes a wire way 75 and a weep channel 76 near the lantern ring 77.
In the nacelle 50, is further disposed a gearbox mounting flange 78 and hand holes 79 in the shovel base 45. In order to effect the placement of the system in a river, lifting eyes 62 and 63 are provided on the shaft housing and the nacelle respectively.
FIG. 8 shows a plumb bow screen 80 for use with the device shown in FIG. 7 and specifically comprising a hoop 81 connected to the mounting ring 61 by plumb spoke 82 and lateral spokes 83. Extending from the top of the hoop 81 is a trailing boom 84 which has a pylon flange 85 at the leading edge thereof. The pylon 85A mounts the turbine from above, as opposed to the FIGS. 1-2 embodiment. Depending downwardly from the pylon flange 85 is plumb bow 86 which supports the bars 87 and 88 which extend from the plumb bow to the hoop. The configuration shown in FIGS. 6-8 is that of an upstream rotor, as opposed to the downstream rotor shown in FIGS. 1-2 and hereinafter in FIGS. 9-11.
FIG. 13 shows an alternative embodiment of the turbine of FIGS. 6-8 in the manner in which the turbine is mounted. As noted above, the configuration shown in FIGS. 6-8 is that of an upstream rotor. FIG. 13 shows the mounting of the same rotor as a downstream rotor connected to a spine 19' similar to that shown in FIG. 1. In the embodiment shown in FIG. 13, all of the elements which are identical in function to those of FIG. 7, are listed with the same label primed.
In addition, this embodiment includes an end plate 92 directly welded to the spine 19' and the nacelle is mounted to the end plate 92 via mounting screws 42'. The end plate 92 has a wire way 75' so that wires can pass through same to the base. The end plate 92 is sealed to the nacelle with an O-ring 91. The spine 19' has a hollow center for communication with the wire-way 75 and for the passage of wires to the base. A reinforcing rib 93 is welded to the end plate 92 to further aid in the support of the turbine.
FIGS. 9-11 are directed to an alternative embodiment of the present invention wherein a bidirectional resource such as a tidal estuary can be used for generating electricity. The system 110 shown therein comprise a reinforced concrete base 11 to which a turbine 130 having downstream rotor 133 is connected along with a screen 120. The system further comprises a bearly 140 for permitting articulation around the yaw axis and comprising stops which permit slightly less than 180° rotation. This means comprises yaw bearing 141 partly embedded in the concrete base 111 connected to pylon 142 which is thereafter connected to nacelle 131.
Nacelle 131 also includes a forward fairing 135 and a hub fairing 136 to make the turbine more aerodynamic that is, helps the water flow more smoothly over the nacelle.
While the screen 120 includes screen grid bars 121, it can also comprise a small diffuser 125 attached to the screen bars. In the embodiment shown in FIGS. 9-11, it can be seen that the design is for a downstream rotor and although this is the preferred embodiment it should be noted that the nacelle and rotor assembly can be reversed to have an upstream of the major portion of the nacelle.
FIG. 12 shows one embodiment of a kinetic hydro energy conversion system site using 10 turbines, all commonly connected to an electric grid.
As shown, five sets of two generators 201-210 are spaced apart every 40 meters. Generators 201 and 202 are connected respectively by submarine cables to two generator control boxes per pole 211, 212, turbines 203 and 204 are connected to boxes 213, 214, turbines 205 and 206 are connected to boxes 215, 216, turbines 207 and 208 are connected to boxes 217, 218 and turbines 209 and 210 are connected to boxes 219 and 220.
Two cables 221 connect boxes 211 and 212 to boxes 213 and 214 and two cable 224 connect boxes 219 and 220 to boxes 217 and 218. Four cables 222 are used to connect boxes 213, 214 to boxes 215 and 216 and four cables 223 are used to connect boxes 217 and 218 to boxes 215 and 216.
In one example, cable emanating from boxes 215 and 216 carrying 480 volts at 200 kilowatts is connected to a common switch gear 226 which can be a box or building on shore and which contains control logic and protective relaying for conditioning the power grid and interconnecting with utility grid or local damand. The output of the common switch gear 226 on cable 227 is 13 kilovolts at 200 kilowatts.
It will be appreciated that the instant specification and claims are set forth by way of illustration and not limitation, and that various modifications and changes may be made without departing from the spirit and scope of the present invention.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US61362 *||Jan 22, 1867||Abram rowe|
|US328593 *||Oct 20, 1885||Floating current-motor|
|US507294 *||May 31, 1893||Oct 24, 1893||Water-motor|
|US867192 *||Sep 13, 1906||Sep 24, 1907||Robert W Gees||Floating power plant.|
|US868798 *||Feb 20, 1905||Oct 22, 1907||Robert Mclaughlin||Means for obtaining power from flowing water.|
|US903592 *||Jan 3, 1907||Nov 10, 1908||Charles J Low||Power-generator.|
|US914574 *||Dec 10, 1907||Mar 9, 1909||Edwin Imboden||Current-motor.|
|US1123491 *||May 12, 1913||Jan 5, 1915||Elbert A Corbin||Power-conversion plant.|
|US1147658 *||Dec 20, 1913||Jul 20, 1915||John M Stukes||Water-motor.|
|US1396609 *||May 4, 1920||Nov 8, 1921||Said George P A Weisenborn||Current or tide motor|
|US1512545 *||Sep 1, 1921||Oct 21, 1924||Kaplan Viktor||Runner wheel for turbines, etc.|
|US1555879 *||Dec 12, 1924||Oct 6, 1925||Ruzicka Frank||Motor|
|US1602755 *||Mar 20, 1925||Oct 12, 1926||Nieuport Astra Sa||Metallic propeller with adjustable pitch and detachable blades|
|US1669055 *||Aug 2, 1926||May 8, 1928||Francis Hogg||Signal device|
|US1713446 *||Jul 5, 1928||May 14, 1929||Gabull Peterson||Propeller guard|
|US1790969 *||Apr 2, 1929||Feb 3, 1931||Tide and current motor|
|US1903545 *||Mar 3, 1931||Apr 11, 1933||Alvah T Hampton||Current motor|
|US2116055 *||Jan 17, 1936||May 3, 1938||John Weichwald||Propeller|
|US2213610 *||Apr 25, 1938||Sep 3, 1940||Ronning Adolph||Boat propulsion apparatus|
|US2355842 *||Jun 28, 1943||Aug 15, 1944||Arado John G||Combined cutter, distributor, and protector for outboard motors|
|US2501696 *||Aug 6, 1947||Mar 28, 1950||Wolfgang Kmentt||Stream turbine|
|US2723641 *||Nov 21, 1951||Nov 15, 1955||Taylor John W||Guard for an outboard motor propeller|
|US3027864 *||Nov 14, 1960||Apr 3, 1962||Polson Virgil L||Propeller guard|
|US3209156 *||Apr 3, 1962||Sep 28, 1965||Jr Arthur D Struble||Underwater generator|
|US3980894 *||Jul 2, 1974||Sep 14, 1976||Philip Vary||Flow tubes for producing electric energy|
|US3986787 *||Oct 15, 1975||Oct 19, 1976||Mouton Jr William J||River turbine|
|US4026587 *||Apr 24, 1975||May 31, 1977||Hultman Robert H||Underwater turbine operated by ocean currents|
|US4116581 *||Jan 21, 1977||Sep 26, 1978||Bolie Victor W||Severe climate windmill|
|US4163904 *||Mar 6, 1978||Aug 7, 1979||Lawrence Skendrovic||Understream turbine plant|
|US4274009 *||Nov 9, 1978||Jun 16, 1981||Parker Sr George||Submerged hydroelectric power generation|
|US4306157 *||Jun 20, 1979||Dec 15, 1981||Wracsaricht Lazar J||Underwater slow current turbo generator|
|US4313059 *||Oct 20, 1980||Jan 26, 1982||Howard Gerald T||Sea current energy system|
|US4324984 *||Feb 3, 1981||Apr 13, 1982||Hydrodynamic Energy Systems Corp.||Portable hydrogenerating apparatus|
|CA456963A *||May 24, 1949||Wincharger Corp||Wind driven prime mover|
|FR989170A *||Title not available|
|FR2485106A1 *||Title not available|
|NO28244A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4776755 *||Mar 26, 1987||Oct 11, 1988||Wartsila Meriteollisuus Oy||Shrouded propeller|
|US5798572 *||Apr 15, 1996||Aug 25, 1998||Lehoczky; Kalman N.||Under water hydro-turbine energy generator design|
|US6104097 *||Mar 4, 1999||Aug 15, 2000||Lehoczky; Kalman N.||Underwater hydro-turbine for hydrogen production|
|US6452287||Jun 13, 2000||Sep 17, 2002||Ivan Looker||Windmill and method to use same to generate electricity, pumped air or rotational shaft energy|
|US6531788 *||Feb 22, 2001||Mar 11, 2003||John H. Robson||Submersible electrical power generating plant|
|US6798080||Oct 5, 2000||Sep 28, 2004||Access Business Group International||Hydro-power generation for a water treatment system and method of supplying electricity using a flow of liquid|
|US6885114||Oct 9, 2003||Apr 26, 2005||Access Business Group International, Llc||Miniature hydro-power generation system|
|US6903466 *||Aug 31, 2000||Jun 7, 2005||Alstom||Wind-power generator pod constituted by the body of an electricity generator|
|US6927501||Jan 17, 2004||Aug 9, 2005||Access Business Group International, Llc||Self-powered miniature liquid treatment system|
|US6982498||Jan 9, 2004||Jan 3, 2006||Tharp John E||Hydro-electric farms|
|US6995479||Aug 5, 2005||Feb 7, 2006||Tharp John E||Hydro-electric farms|
|US6998730||Aug 5, 2005||Feb 14, 2006||Tharp John E||Hydro-electric farms|
|US7042114||Aug 5, 2005||May 9, 2006||Tharp John E||Hydro-electric farms|
|US7067936||Apr 20, 2005||Jun 27, 2006||Access Business Group International, Llc||Self-powered miniature liquid treatment system with multiple liquid flow paths|
|US7105942 *||Jul 8, 2002||Sep 12, 2006||Hydra Tidal Energy Technology As||Plant, generator and propeller element for generating energy from watercurrents|
|US7119451||Apr 20, 2005||Oct 10, 2006||Access Business Groupinternational, Llc.||Self-powered miniature liquid treatment system with ultraviolet dosing|
|US7190087 *||Jul 20, 2005||Mar 13, 2007||Williams Herbert L||Hydroelectric turbine and method for producing electricity from tidal flow|
|US7215036 *||May 19, 2005||May 8, 2007||Donald Hollis Gehring||Current power generator|
|US7233078||Mar 4, 2005||Jun 19, 2007||Access Business Group International, Llc||Miniature hydro-power generation system|
|US7291936 *||May 3, 2006||Nov 6, 2007||Robson John H||Submersible electrical power generating plant|
|US7345376 *||Nov 28, 2005||Mar 18, 2008||Distributed Energy Systems Corporation||Passively cooled direct drive wind turbine|
|US7352074 *||Nov 13, 2000||Apr 1, 2008||Peter Alexander Josephus Pas||System for producing hydrogen making use of a stream of water|
|US7352078 *||Aug 2, 2005||Apr 1, 2008||Donald Hollis Gehring||Offshore power generator with current, wave or alternative generators|
|US7372172 *||Jun 3, 2004||May 13, 2008||Va Tech Hydro Gmbh||Device and method for the generation of electrical energy|
|US7456514||Apr 10, 2006||Nov 25, 2008||Verdant Power||Kinetic hydropower generation from slow-moving water flows|
|US7462945||Oct 31, 2007||Dec 9, 2008||Access Business Group International, Llc.||Self-powered miniature liquid treatment system|
|US7597532||May 8, 2006||Oct 6, 2009||Verdant Power, Inc.||Single sided power generator support frame|
|US7663257||Sep 15, 2006||Feb 16, 2010||Access Business Group International, Llc||Self-powered miniature liquid treatment system with configurable hydropower generator|
|US7663258||Oct 31, 2007||Feb 16, 2010||Access Business Group International, Llc||Miniature hydro-power genteration system power management|
|US7663259||Oct 31, 2007||Feb 16, 2010||Access Business Group International, Llc||Self-powered miniature liquid treatment system|
|US7675188||Oct 31, 2007||Mar 9, 2010||Access Business Group International, Llc||Miniature hydro-power generation system|
|US7701076||Oct 31, 2007||Apr 20, 2010||Access Business Group International, Llc||Hydro-power generation system|
|US7768147||Jul 21, 2009||Aug 3, 2010||Access Business Group International, Llc||Miniature hydro-power generation system|
|US7789629||Dec 7, 2006||Sep 7, 2010||Verdant Power||Non-fouling kinetic hydro power system axial-flow blade tip treatment|
|US7812470||Oct 31, 2007||Oct 12, 2010||Access Business Group International Llc||Method for making miniature hydro-power generation system|
|US7851936||Oct 16, 2008||Dec 14, 2010||Anadarko Petroleum Corporation||Water current power generation system|
|US7877170||May 24, 2007||Jan 25, 2011||Verdant Power||Remanent voltage generator tachometer and control for induction machine|
|US7928594 *||Dec 14, 2007||Apr 19, 2011||Vladimir Anatol Shreider||Apparatus for receiving and transferring kinetic energy from a flow and wave|
|US7932618||Dec 23, 2009||Apr 26, 2011||Access Business Group International Llc||Miniature hydro-power generation system power management|
|US7956481||Jul 30, 2010||Jun 7, 2011||Access Business Group International Llc||Miniature hydro-power generation system|
|US7973240 *||Mar 23, 2007||Jul 5, 2011||Verdant Power||Cable jacket sealing, pressurization, and monitoring|
|US7997870||Aug 14, 2007||Aug 16, 2011||B N Balance Energy Solutions, Llc||Turbine rotor for electrical power generation|
|US8188609||Mar 22, 2011||May 29, 2012||Access Business Group International Llc||Miniature hydro-power generation system power management|
|US8288882||May 17, 2011||Oct 16, 2012||Anadarko Petroleum Corporation||Fin-ring propeller for a water current power generation system|
|US8303241 *||Nov 13, 2007||Nov 6, 2012||Verdant Power, Inc.||Turbine yaw control|
|US8426992||May 24, 2012||Apr 23, 2013||Access Business Group International Llc||Self-powered miniature liquid treatment system with configurable hydropower generator|
|US8633609||Apr 14, 2009||Jan 21, 2014||Atlantis Resources Corporation Pte Limited||Sub sea central axis turbine with rearwardly raked blades|
|US8659180 *||Feb 18, 2011||Feb 25, 2014||Fourivers Power Engineering Pty Ltd.||Power generation apparatus|
|US8664790||Apr 28, 2010||Mar 4, 2014||Atlantis Resources Corporation Pte Limited||Underwater power generator with dual blade sets|
|US8801386 *||Apr 14, 2009||Aug 12, 2014||Atlantis Resources Corporation Pte Limited||Blade for a water turbine|
|US8834115||Sep 28, 2011||Sep 16, 2014||Alstom Renewable Technologies||Girder for supporting a tidal turbine fairing and tidal turbine comprising such a girder|
|US8920200||Oct 26, 2010||Dec 30, 2014||Atlantis Resources Corporation Pte||Connector for mounting an underwater power generator|
|US20040070210 *||Feb 12, 2002||Apr 15, 2004||Harald Johansen||Apparatus for production of energy from currents in bodies of water, a foundation, and a method for the installation of the apparatus|
|US20040189010 *||Jan 9, 2004||Sep 30, 2004||Tharp John E.||Hydro-electric farms|
|US20040195840 *||Oct 9, 2003||Oct 7, 2004||Baarman David W.||Miniature hydro-power generation system|
|US20040219015 *||Jun 3, 2004||Nov 4, 2004||Va Tech Hydro Gmbh & Co.||Device and method for the generation of electrical energy|
|US20050077732 *||Jan 17, 2004||Apr 14, 2005||Baarman David W.||Self-powered miniature liquid treatment system|
|US20050189769 *||Apr 20, 2005||Sep 1, 2005||Access Business Group International, Llc||Self-powered miniature liquid treatment system with ultraviolet dosing|
|US20050189770 *||Apr 20, 2005||Sep 1, 2005||Access Business Group International, Llc||Self-powered miniature liquid treatment system with multiple liquid flow paths|
|US20050236841 *||Jul 8, 2002||Oct 27, 2005||Hydra Tidal Energy Technology As||Plant, generator and propeller element for generating energy from watercurrents|
|US20060113804 *||Nov 28, 2005||Jun 1, 2006||Costin Daniel P||Passively cooled direct drive wind turbine|
|US20060261597 *||Aug 2, 2005||Nov 23, 2006||Gehring Donald H||Offshore power generator with current, wave or alternative generators|
|US20070018459 *||Jul 20, 2005||Jan 25, 2007||Williams Herbert L||Hydroelectric turbine and method for producing electricity from tidal flow|
|US20070063520 *||Apr 10, 2006||Mar 22, 2007||Verdant Power||Kinetic hydropower generation from slow-moving water flows|
|US20070120368 *||Sep 15, 2006||May 31, 2007||Access Business Group International, Llc||Self-powered miniature liquid treatment system with configurable hydropower generator|
|US20070120371 *||May 19, 2005||May 31, 2007||Gehring Donald H||Current power generator|
|US20070257492 *||May 3, 2006||Nov 8, 2007||Robson John H||Submersible electrical power generating plant|
|US20080018115 *||Jul 20, 2006||Jan 24, 2008||Boray Technologies, Inc.||Semi-submersible hydroelectric power plant|
|US20080060184 *||Oct 31, 2007||Mar 13, 2008||Access Business Group International, Llc||Miniature hydro-power generation system|
|US20080116147 *||Oct 31, 2007||May 22, 2008||Access Business Group International, Llc:||Self-powered miniature liquid treatment system|
|US20080138206 *||Dec 7, 2006||Jun 12, 2008||Verdant Power||Non-fouling kinetic hydro power system axial-flow blade tip treatment|
|US20080271803 *||Mar 23, 2007||Nov 6, 2008||Verdant Power||Cable jacket sealing, pressurization, and monitoring|
|US20080290735 *||May 24, 2007||Nov 27, 2008||Verdant Power||Remanent voltage generator tachometer and control for induction machine|
|US20090123283 *||Nov 13, 2007||May 14, 2009||Verdant Power, Inc.||Turbine yaw control|
|US20090146430 *||Dec 10, 2007||Jun 11, 2009||Walter Edmond Sear||Tidal/water current electrical generating system|
|US20090152870 *||Dec 14, 2007||Jun 18, 2009||Vladimir Anatol Shreider||Apparatus for receiving and transferring kinetic energy from a flow and wave|
|US20090257863 *||Jan 30, 2009||Oct 15, 2009||Asia Power Dev. Foundation, Inc.||Turbine assembly|
|US20090278355 *||Nov 12, 2009||Access Business Group International, Llc||Miniature hydro-power generation system|
|US20100013231 *||Oct 16, 2008||Jan 21, 2010||Bolin William D||Water Current Power Generation System|
|US20100295311 *||Jul 30, 2010||Nov 25, 2010||Access Business Group International Llc||Miniature hydro-power generation system|
|US20110076146 *||Mar 31, 2011||Falcone Andrew J||Wind turbine electrical generating system with combined structural support members and straightening vanes|
|US20110109090 *||May 12, 2011||Bolin William D||Fin-Ring Propeller For A Water Current Power Generation System|
|US20110140454 *||Jun 16, 2011||Fourivers Power Engineering Pty Ltd.||Power generation apparatus|
|US20110176915 *||Apr 14, 2009||Jul 21, 2011||Atlantis Resources Corporation Pte Ltd.||Blade for a water turbine|
|US20110293404 *||Nov 3, 2009||Dec 1, 2011||Gestion Rsw Inc.||Submerged Hydroelectric Turbine Having Self-Powered Bearing Lubricant Circulation, Filtering, and Cooling System and Auto-Adaptive Pressure-Compensation System|
|CN102444538A *||Sep 30, 2011||May 9, 2012||阿尔斯通水电设备法国公司||Girder for supporting tidal turbine fairing and tidal turbine comprising same|
|CN102444538B *||Sep 30, 2011||Aug 19, 2015||阿尔斯通再生能源技术公司||支撑潮汐涡轮机整流罩的主梁和包括该主梁的潮汐涡轮机|
|DE102008007043A1 *||Jan 31, 2008||Aug 6, 2009||Voith Patent Gmbh||Freistehende, tauchende Energieerzeugungsanlage mit einer Axialturbine|
|DE102012021689A1 *||Nov 7, 2012||Jan 9, 2014||Voith Patent Gmbh||Current power plant for use under water for generating electricity, has rotor and generator formed as support structures, where longitudinal axis of each rotor blade runs outside of rotational axis of rotor|
|EP2146089A1 *||Nov 19, 2008||Jan 20, 2010||Anadarko Petroleum Corporation||Water current power generation system|
|EP2199603A1 †||Dec 19, 2008||Jun 23, 2010||OpenHydro IP Limited||A method of controlling the output of a hydroelectric turbine generator|
|EP2304110A1 *||Apr 14, 2009||Apr 6, 2011||Atlantis Resources Corporation Pte Limited||Central axis water turbine|
|EP2304110A4 *||Apr 14, 2009||Oct 5, 2011||Atlantis Resources Corp Pte||Central axis water turbine|
|EP2304225A1 *||Apr 14, 2009||Apr 6, 2011||Atlantis Resources Corporation Pte Limited||Blade for a water turbine|
|EP2304225A4 *||Apr 14, 2009||Mar 20, 2013||Atlantis Resources Corp Pte||Blade for a water turbine|
|EP2436917A1 *||Sep 29, 2011||Apr 4, 2012||Alstom Hydro France||Beam for supporting a wind turbine fairing and wind turbine comprising such a beam|
|WO2002081908A1 *||Apr 2, 2001||Oct 17, 2002||Ivan Looker||Improved windmill and method to use same to generate electricity, pumped air or rotational shaft energy|
|WO2007125349A2 *||Apr 30, 2007||Nov 8, 2007||Swanturbines Ltd||Tidal current turbine|
|WO2007130479A2 *||May 3, 2007||Nov 15, 2007||John H Robson||Submersible electrical power generating plant and method|
|WO2009064430A1 *||Nov 13, 2008||May 22, 2009||Dean Corren||Improved turbine yaw control|
|WO2010008368A1 *||Oct 16, 2008||Jan 21, 2010||Anadarko Petroleum Corporation||Water current power generation system|
|U.S. Classification||415/121.2, 290/54, 415/3.1, 416/DIG.2, 416/234, 416/223.00A|
|International Classification||F03B17/06, F03B11/08, F03B3/12|
|Cooperative Classification||Y10S416/02, F03B3/126, F03B17/061, Y02E10/223, F03B11/08, Y02E10/28|
|European Classification||F03B11/08, F03B17/06B, F03B3/12D|
|Mar 22, 1984||AS||Assignment|
Owner name: RIVERSIDE ENERGY TECHNOLOGY, INC. 380 RIVERSIDE DR
Free format text: ASSIGNMENT OF A PART OF ASSIGNORS INTEREST;ASSIGNORS:CORREN, DEAN R.;MILLER, GABRIEL;REEL/FRAME:004242/0779
Effective date: 19840321
|Apr 24, 1990||REMI||Maintenance fee reminder mailed|
|Apr 30, 1990||SULP||Surcharge for late payment|
|Apr 30, 1990||FPAY||Fee payment|
Year of fee payment: 4
|May 3, 1994||REMI||Maintenance fee reminder mailed|
|Sep 25, 1994||LAPS||Lapse for failure to pay maintenance fees|
|Dec 6, 1994||FP||Expired due to failure to pay maintenance fee|
Effective date: 19940928